Multitech 1777.8/7-10 G3 - Manual (Page 11)

Caution
Caution
Caution
Pump sizes
32 to 100
Pump sizes
125 and 150
Caution
Multitec
11
6 Commissioning, start-up / Shutdown
Instructions for boiler feed applications
Limit values for boiler feed water and condensate when using
cast iron pump parts: pH value ³ 9.0 (target: ³ 9.3)
O
2
content
≤
0.02 ppm.
These values must be ensured under all operating conditions
before entry into the pump. Max. percentage of fresh water:
25%.
Water treatment shall be in accordance with VdTÜV guidelines
for feed and boiler water in steam plants of up to 64 bar.
The penetration of air into the system must be avoided by all
means.
6.1
Commissioning
Before starting up the pump make sure that the
following requirements have been met:
- The quality of the concrete foundation is in compliance with
the applicable regulations.
- The tolerances stipulated for mounting the unit on the
foundation, for shims and alignment have been complied
with.
- The pipelines have been connected without warping the
pump nozzles.
- Electrical connection and relay settings correspond to the
motor rating and comply with the applicable regulations.
- All hydraulic, electrical and mechanical protection devices
have been set.
- The pump has been fully primed with the fluid to be pumped.
- The unit’s direction of rotation corresponds to the rotation
arrows.
- All connections are leak-free.
For installation without foundation (e.g. on spring
elements) care must be taken that all movements
of the pump unit can be compensated, e.g. by fitting expansion
joints in the discharge and suction lines.
6.1.1 Lubricants
Grease-lubricated bearings
The grease-lubricated bearings are packed with grease at the
factory (see section 7.2.2).
Oil lubricated bearings
Fill oil of ISO VG 46 quality into the bearing cover (see section
7.2.2).
6.1.2 Priming the pump and checks to be carried out
Before each start-up, the pump and the suction line must be
completely vented and primed with the fluid to be pumped. The
pump has several plugged holes for venting; adequate venting
devices can be used in the pipelines. The shut-off valve in the
suction or feed line must be fully open.
Fully open all auxiliary connections provided and check the
throughflow.
Open shut-off valve ”C” in the vacuum balance line (if any), and
close the vacuum-tight shut-off valve ”E” (see 5.4.1).
Dry running will lead to increased wear on the unit
and may eventually damage the pump !
If the discharge line is equipped with an automatic check valve,
open the minimum flow valve and secure against inadvertent
closing.
Exceptions:
- If there is not enough back pressure in the line prior to
start-up, the shut-off element must be closed before pump
start-up.
- On pumps fitted with a mechanical seal, the mechanical seal
will leak only slightly, i.e. practically invisibly (vapour) during
operation. It is maintenance-free.
- If the pump is equipped with a gland packing, leakage during
operation is normal (see 6.1.6).
Special notes regarding cooled mechanical seals
(seal code 64)
- If the pump is equipped with a cooled mechanical seal, vent
the seal chamber by opening the screwed plug 903.11 by a
quarter turn, then re-tighten.
Fig. 14
Fig. 15
The seal chamber has to be vented when the
pump is in cold condition before start-up. When
venting in hot condition, steam will escape at the vent plug
during the venting process (risk of scalding!) Should it not be
possible to avoid opening the seal chamber in hot condition,
due to the situation in the plant, a pipe with valve (not included in
KSB’s scope of supply) must be installed at the vent hole, in
order to lead the steam escaping during venting to another
place where there is no danger of scalding. Make sure that this
valve cannot be opened during operation.